Robert lundell



(No Model.)

R. LUNDELL. DYNAMO BLEGTRIG MAG-EINE on BLBGTRIG MOTOR.

No. 505,665. Patented Sept. Z6, 1893.

Immmlllll. Illini UNITED STATES PATENT OFFICE.

ROBERT LUNDELL, OE BROOKLYN, AssIeNOR OF Two-THIRDS TO `EDWARD H.JOHNSON, OE NEW YORK, N. Y.

DYNAMO-ELECTRIC MACHINE OR ELECTRIC MOTOR.

SPECIFICATION forming part of Letters Patent No. 505,665, datedSeptember 26, 1893.

Application filed October 31,1892. Serial No. 450,506. (No model.) l

T0 all whom t may concern:

Be it known that I, ROBERT LUNDELL, a citizen of the United StatesI ofAmerica, residing at Brooklyn, in the county of Kings and State of NewYork, have invented certain new and useful Improvements in Dynamo-Electric Machines or Electric Motors, of which the following is aspecification.

My invention is directed particularly to commutator brush holdingattachments for suoli machines and its objects are to furnish a simple,cheap and eiiicient means for causing the brushes to be fed constantlyforward as they are worn away upon the surface of the commutator, and torender these parts equally and readily detachable for the purpose ofinserting new brushes or making such other changes as the necessities ofthe case may demand.

The invention Will be fully understood by referring to the accompanyingdrawings, in which- Figure l illustrates in plan view a rocker arm ofwell known form sustaining a pair of my improved commutator brushholding devices with comniutator brushes in position resting upon theface of the commutator, which latter with the end of the armature of adynamo machine or electric motor is illustrated in dotted lines. Fig. 2is a part end elevational, part sectional View taken on the broken line2-2, Fig. l, and as seen looking in the direction of the arrows. Fig. 3is a side elevational view of Fig. l as seen looking from left to right.Fig. 4 is a plan view of one of the brush feeding springs as it appearswhen removed from the brush holder'.

Referring now to the drawings in detail in all of which like letters ofreference represent like parts wherever used, A represents the armatureof an electric motor or dynamo electric machine, C the commutator and Rthe usual well known form of rocker arm provided with extensions D D towhich the cominutator brush holders are secured by bolts and nuts N N inthe usual manner, the rocker arm being secured adj ustably in therequired position by a set screw s.

c c are the commutator brush holders which are in the nature of hollowsleeves with openings or slits in the direction of their length orlongitudinal axes in their upper sides, the hollow portions of thebrushholders being of substantially the same size and contour(preferably rectangular) as the commutator brushes B B made of carbon orother well known equivalent material. The brush holders are provided attheir outer ends with lugs or ears having each a pair of inclinednotches lo 7c adapted to sustain the trunnions e e on 6o the outer endsof the fiat carbon feeding springs S S, the inner ends of which areprovided with pins P of substantially the same width as the carbonbrushes.

The apparatus is puttogether for operation as follows: The brushes B Bare first slid into position resting upon the commutator C as clearlyshown in Figs. l and 2. The pinsP P -on the inner ends of the springs SS are then placed against the outer ends of the brushes 7o and thesprings are then bent so as to allow the trunnions e e, e c to drop intothe notches 7o 7c. Under these conditions the springs S S will force thebrushes forward and keep them always in position with their inner endsagainst the face of the commutator. As they wear away the pins P P willcontinue to feed them forward under this yielding influence.

I am aware that it is broadly old to force commutator brushes forwardunder the in- 8o liuence Of springs and weights, and I make no claimhereinafter broad enough to include these generic features.

Having thus described my invention, what I claim, and desire to secureby Letters Patent of the United States, is-

1. A brush holding device consistingof ahollow sleeve slittedin thedirection of its length, in combination with a detachable springcarrying a follower on one end and having a 9o bearing or support in thesleeve at the other end, the end which carries the follower havingmovement in the slit as the follower bears against and moves forwardwith the brush substantially as described.

2. In a brush holdingdevice, a hollow sleeve slitted in the direction ofits length, in combination with a follower consisting of a bearing orpin borne by a dat spring extending through the slit and connected to asecond roo bearing journaled or pivoted in the sleeve substantially asdescribed.

3. A brush holding device consisting of zt hollow sleeve slitted in Ichedirection of its 5 length, in Combination with zt detachable springcarrying a follower at one end which bears against the end of the brush,and trunnions or bearings at the other end thereof supported in thesleeve substantially as delo scribed.

4. A brush holding` device consisting of a hollow sleeve having; i slitor opening on its upper side in Combination with :L detachable springhaving' trunnions on one end adapted to hear in corresponding notchesinthe outer 15 ends of the sleeve and a pin ou the other end adapted tobear upon the eonimutntorbrush, substantially as described.

ROBERT LUNDELL. lVitnesses:

C. J. KiNTNER, M. M. ROBINSON.

